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tanning
(Encyclopedia) tanning, process by which skins and hides are converted into leather. Vegetable tanning, a method requiring more than a month even with modern machinery and tanning liquors, employs…chromium
(Encyclopedia) chromiumchromiumkrōˈmēəm [key] [Gr.,=color], metallic chemical element; symbol Cr; at. no. 24; at. wt. 51.9961; m.p. about 1,857℃; b.p. 2,672℃; sp. gr. about 7.2 at 20℃; valence +2, +3…Weirton
(Encyclopedia) Weirton, city (1990 pop. 22,124), Brooke and Hancock counties, NW W.Va., in the industrial Northern Panhandle, on the Ohio River; settled 1790s, inc. 1947. Its industries include coal…Mugodzhar Hills
(Encyclopedia) Mugodzhar HillsMugodzhar Hillsm&oomacr;gəjärˈ [key], range, c.275 mi (440 km) long, E Kazakhstan. The southern spur of the Urals, it forms the divide between the Caspian and the…California
(Encyclopedia) CE5 CaliforniaCaliforniakălˌĭfôrˈnyə [key], most populous state in the United States, located in the Far West; bordered by Oregon (N), Nevada and, across the Colorado River, Arizona…Lufkin
(Encyclopedia) Lufkin, city (1990 pop. 30,206), seat of Angelina co., E Tex.; inc. 1890. Situated in the deep pine woods, it is the core of a region of forest industries with many sawmills and the…Mersin
(Encyclopedia) MersinMersinmĕrsĭnˈ [key], formerly IçelIçelēchĕlˈ [key], city (1990 pop. 420,750), capital of Içel prov., S Turkey, on the Mediterranean Sea. A rail terminus and modern seaport, it…morocco, type of leather
(Encyclopedia) morocco, goatskin leather, dyed on the grain side and boarded by hand or machine to bring up the grain in a bird's-eye effect. It probably originated with the Arabs in North Africa as…pigment
(Encyclopedia) pigment, substance that imparts color to other materials. In paint, the pigment is a powdered substance which, when mixed in the liquid vehicle, imparts color to a painted surface. The…sodium thiosulfate
(Encyclopedia) sodium thiosulfate, Na2S2O3, colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O3·5H2O, an efflorescent, monoclinic crystalline substance also called…